This SAE Standard provides a uniform method to calculate the lift capacity of knuckle-boom log loaders and certain forestry equipment. It establishes definitions and specifies machine conditions for calculations. This document applies to knuckle-boom log loaders as defined in ISO 6814 and ISO 17591 and certain forestry equipment defined in ISO 6814 that have a rotating upper-structure such as feller bunchers, forwarders, harvesters, and behind the cab or rear-mounted knuckle-boom log loaders not having their own power supply. It does not apply to harvesters that are incapable of lifting a tree or log completely off the ground. This document applies to those machines that are crawler, rubber-tired, and pedestal or stationary mounted.
The references listed in sections 1.0 SCOPE, 2.1.1 SAE Publications, Rationale, Application, and Reference Sections are no longer accurate, and shall be revised to indicate proper referencing below:
Reference SAE J1209 – Identification Terminology of Mobile Forestry Machine has been superseded by ISO 6814 – Machinery for forestry – Mobile and self-propelled machinery - Terms, definitions and classification.
Reference SAE J2055 Identification Terminology and Component Nomenclature Knuckle Boom Log Loader has been superseded by ISO 17591 – Machinery for forestry – Knuckle Boom Log Loaders – Identification terminology, classification and component nomenclature.
Reference SAE J1255 – Specification Definitions – Feler/Buncher has been superseded by ISO 13862 – Machinery for forestry – Feller-bunchers - Terms, definitions and commercial specifications.
Reference SAE J1097 Hydraluic Excavator Lift Capacity Calculation and Test Procedure has been superseded by ISO 10567 – Earth-moving Machinery – Hydraulic excavators – Lift capacity.